In a past life I had a real problem with a solenoid causing serious EMC,
primarily from the coil discharge. Diodes across the coil helped some, but we
ended up having to create a soft drive and a discharge circuit in order to
tame the unruly beast. So how anyone can say solenoids are benign from an EMC
standpoint is beyond me.
Scott Douglas
Price, Edward wrote:
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Gordon,Ian
Sent: Monday, September 21, 2009 12:32 AM
To: White, Ian
Cc: IEEE EMC & SAFETY PSTC
Subject: RE: EMC Directive and solenoid valves
Ian et al
We manufacture solenoid operated vacuum valves (amongst other
things)
and obtained a statement from ERA to the effect that they were
benign
as
far as the EMC directive is concerned.
Ian Gordon
When the solenoid is de-energized, isn't there a large and fast voltage
generated? When a solenoid manufacturer puts a diode across the coil to
limit the voltage, doesn't the large current flowing through the diode
and coil create a spectral distribution of energy? Perhaps the Directive
ignores the short duration burst, but I don't think you can call a
solenoid coil completely benign.
Ed Price
[email protected] WB6WSN
NARTE Certified EMC Engineer
Electromagnetic Compatibility Lab
Cubic Defense Applications
San Diego, CA USA
858-505-2780
Military & Avionics EMC Is Our Specialty
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